Yes! They'd keep the racial +2 to Charisma, but gain +1Strength or Dex.
And switch out Hellish Resistance to for Death Resistance giving them Necrotic Resistance and Vampiric Legacy instead of Infernal Legacy. Swap out Hellish Rebuke for a more Vampiric Spell.
Another one along this theme is the 4e Bladelings, who were created from mortal humans by Bane, infusing them with his essence. I'm swop out Hellish Resistance for Rust Resistance which would grant acid resistance, and Infernal Legaxy for Blade Legacy which would swap out Hellish Rebuke for some kind of blade spray AoE attack spell. And change the subrace buff to +1 Dex.
And switch out Hellish Resistance to for Death Resistance giving them Necrotic Resistance and Vampiric Legacy instead of Infernal Legacy. Swap out Hellish Rebuke for a more Vampiric Spell.
Another one along this theme is the 4e Bladelings, who were created from mortal humans by Bane, infusing them with his essence. I'm swop out Hellish Resistance for Rust Resistance which would grant acid resistance, and Infernal Legaxy for Blade Legacy which would swap out Hellish Rebuke for some kind of blade spray AoE attack spell. And change the subrace buff to +1 Dex.